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© Sierra College Astronomy Department

7

Dimensions of the Moon

Angular size (0.5 degrees)

Linear size (inferred from lunar eclipses)

Distance (Small Angle Formula relates distance to angular and linear size)

An example of a geometric approach to astronomy

Made first estimate of Earth-Sun distance (relative to Earth-Moon distance)

Also suggested a Sun-centered universe

Ancient Astronomy Aristarchus (310-230 BC)

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